Heater for domestic boilers



Dec; 18, 1928. 1,695,352

T. H. STAMP HEATER FOR DOMESTIC BOILERS Filed June 21, 1926 L J i 3/ J10 4 13 1 1 Z? r a a J 11 19 v 16 4 H if I .r a 7 DEB 1.9 75 jg 35 76125.

19 a 11 I 75 fl Patented Dec. 18, 1928.

UNI TED STATES THOMAS H. s'rAMr, oF sUFrALo, new YORK.

HEATER on DOMESTIC BOILERS. j

Application filedJune 21, 1926. Serial No. 117,343.

This invention relates to the type of heaters designed more particularlyfor domestic water boilers and comprising a heat-confining jacket partlyor whollysurrounding the boiler and having a burner in its lower portionfor heating it. i v

One of the objects of the invention is the improvement of the heaterwith a view of keeping its outer side cool and at the same time holdingthe rising current of hot air closely against the boiler to heat it moreef :t'ectually and in less time.

A further object is to so construct the heater as to effect completecombustion of the gas before being allowed to escape through the exitflue.

In the accompanying drawings Figure 1 is a side elevation of a domesticwater boiler equipped with the improved heater. Figure 2 is an enlargedvertical section of the heater applied to the boiler.Figure3isahorizontal section on line 3-3, Fig. 2. Figure 1 is a detachedfragmentary side elevation of the supplemental heater. Figure 5 is ahorizontal section of a modified form of the heater.

Similar characters of reference indicate corresponding parts throughoutthe several views.

10 indicates a domestic boiler of the usual cylindrical form. It may bemounted on the customary stand 11.

In the embodiment of the invention shown in Figs. 1-3, the heaterconsists of a segmental jacket or casing 12 of suitable height whichextends around about one-third of the circumference of the boiler and isprovided in its lower portion with a burner 13, preferably a gas burner,and at its top with an exit pipe 14.-

The jacket is open at its inner side to expose the surface of the boilerdirectly to the flames of the burner and the ascending hot air; and, asshown in Fig. 2, the jacket is provided at its upper and lower ends withsegmental rims or bearing-faces 15, 16, which conform to and are tightlyfitted against the side of the boiler and the upright edges of thejacket are like.- wise fitted against it to prevent the escape of thehot-air and products of combustion at those points. The jacket isclamped to the boiler by a U-shaped belt or strap 16", or other means.Otherwise, the jacket is closed on all sides, excepting a horizontal rowof airinlets 17 in its lower portion just above the burner.

In its preferred form, the upper portion of the jacket is contracted ortapered upwardly, as shown at 18,'while its lower portion 19, whichcontains the air inlets l7is enlarged beyond the radius of the body andthe base of the heater to provide an ample air and mixing chamber. Theburner may be of any appropriate construction, that illustrated in thedrawings consisting of a horizontal gas conduit or chamber 20 extendingthroughout the base of the jacket and cast integral with it and providedin close proximity to the boiler-wall with one or more rows of openings21 through which the gas issues in numerous ets directly against theboiler. A gas supply pipe 22 having an'air-mixer 23 of any suitableconstruction is connected to the burner-conduit.

Arranged in the heating jacket about midway between its wall and thewall of the boiler is an imperforate upright partition 24:. Thispartition is concentric with the wallof the jacket and preferably risesfrom about the horizontal center line of the air-inlets 17 to the baseof the reduced top 18 of the jacket. The partition forms with the jacketwall an outer non-conductive space or passage 25 through which the airentering the inlets 17 Y rises, keeping the outer side of the jacketcomparatively cool. The space 26 between the partition and the boilerform a hot-air flue, the partition confining the ascending current ofhot air against the boiler, thereby obtaining the maximum effect andexpediting the heating ofthe water to the required temperature.

By extending the partition down to the air inlets 17 practicallycomplete combustion of the gas takes placein the lower portion of thehot-air flue 26 adjacent to the gas burner, with the result that the gasproducts are fully burned before reaching the top of said The partition,by forming this cooling flue, does away with the usual jacket-lining ofasbestos or other non-conductive material.

A water-circulating device 28 may be arranged in the hot-air flue 26,for heating the water in the boiler. For -example,this device mayconsist of upper'and lower manifolds 29, 30 connected bywater-circulating tubes 31, the manifolds communicatingwith theboiler'by pipe-connections 32, 33.

It has been found in practice that a segmental jacket, embracing aboutone-third of the circumference of the boiler, is suflicient toheat thewater to the required temperature and having bearing faces conforming toa water boiler, the jacket being provided in its base with a burner andhaving air inlets in its lower portion above the burner, and anin'iperfolt-ite upright partition arra 'gged in the jacket about midwaybetween its outer Wall and its bearing faces, forming an air between thejacket and the partition, the lower end of the latter terminating nearsaid air inlets.

A heater of the character described, comprising a jacket open at itsinner side and having bearing faces conforming to a Water boiler, thejacket having a burner and an exit, partit e in th ja k t b e n its IURIwa a t h a ng f e di p eed 911- nt aially h rewith, the ja k t av ng a rinlets in the lower portion of its wall, and Wat eireula ng mean l atedo th nne side of said partition.

THOMAS H- MP.-

